remanned 5.7 mercruiser break in procedure help

[lil buggy]

recently i had my engine remanned and i am getting conflicting answers on the optimum mercruiser break in procedure.
20 hrs first oil change?
any help would be greatly appretiated.

 

[mark1905]

Re: remanned 5.7 mercruiser break in procedure help

http://www.perfprotech.com/store/articles/merc-breakin.aspx

In a nutshell, don't rev it too high.. don't rev it too low.. don't keep it at one RPM for too long. Rinse and repeat. Change oil after 20 hours.

 

[lil buggy]

Re: remanned 5.7 mercruiser break in procedure help

Mark,
thanks for the link, very helpful to me. so far i didnt break the rules,,, and thats great.

 

[mark1905]

Re: remanned 5.7 mercruiser break in procedure help

Nice

A big thing that I've always been told is to vary the throttle position while cruising as to give it a range of RPMs to "get used to".

Then again.. I remember when I first started working on engines when I was 16-ish and this crusty old bracket racer told me with the cigarette bouncing from his lips.. "You know how I break a new engine in? I drive the sh!t out of 'em. That's how."

 

[lil buggy]

Re: remanned 5.7 mercruiser break in procedure help

Nice

A big thing that I've always been told is to vary the throttle position while cruising as to give it a range of RPMs to "get used to".

Then again.. I remember when I first started working on engines when I was 16-ish and this crusty old bracket racer told me with the cigarette bouncing from his lips.. "You know how I break a new engine in? I drive the sh!t out of 'em. That's how."

bahahaha,,,, i can picture the old salt,,,, bahahaha.

so far i am not burning any oil,,,, i have been varying the throttle so that helps. although tempted i havent got her past 2500rpm. did get her on a plane though,,,,, what a difference, before reman it struggled at wot to get on plane. i am lovin the sweet sound of the reman, and using alot less gas too,,,lol

 

[mark1905]

Re: remanned 5.7 mercruiser break in procedure help

Don't be scared.. she can take 2/3 throttle in the first 10 hours. In fact, she needs it to break in properly. Go for 3/4 - a hair under WOT after the 10 hour mark while varying it gently..

 

[lil buggy]

Re: remanned 5.7 mercruiser break in procedure help

i'll be runin her tonite some, and got a cruise planned for tomorrow. 2/3 throttle should be about 3000 rpm wot range is 4400-4800 if my maths correct,lol. ill get her there and see how it goes tonite. thanks for the advice

 

[lil buggy]

Re: remanned 5.7 mercruiser break in procedure help

got another hour of break in on her last night. the belts were squeelin some but did calm down

 

[mark1905]

Re: remanned 5.7 mercruiser break in procedure help

Make sure you give her a good visual once over either before or after every use! Now is the time when that bolt that wasn't quite snug will back itself out. Check your water neck, your belt tensions, etc etc. Get back there and try and wiggle anything that you can get your hands on. Make extra sure that everything is tight and copacetic..

 

[MolsonCanadian]

Re: remanned 5.7 mercruiser break in procedure help

and tighten hose clamps!

 

[mark1905]

Re: remanned 5.7 mercruiser break in procedure help

and tighten hose clamps!

YES

..and use a ratchet on those bolts. On your 20 hour oil change, I would highly recommend putting a ratchet/socket on everything you can and just make extra sure that it's snug.


The 4th or 5th day out after my last engine was replaced, I lost power steering while running. I immediately shut her down and pop the engine compartment.. only to find not only my power steering pump just hanging with the belt off, but a bilge full of water. The main 3/8 bolt that goes through the top of the bracket and the water neck had backed out and water had been shooting out and filling the bilge.. and finally took out the pump. Whoops!

Check those bolts.

 

[lil buggy]

Re: remanned 5.7 mercruiser break in procedure help

thanks fellas,
i got another hour and a half on her yesterday,,, great advice by the way, i was diggen in the engine comartment yesterday before the ride, seems my temp sender is bad and needs replaced, guage is ok. while in there i did check some bolts for tightness and all seemed ok. today i will replace te sender and tighten the belts before another trip. while at it i will check some more bolts and hoses.

thanks for the replies